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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6cb0d9cb2e0f7df58662abc1c036ada92f27cc688109b38b27016118e1d07e' 
  AND token = 'NJ7dYhzuV/VdRH3xOJpGF2z7OR3PYs23l5zlooE7nTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}