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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd73282b1f39d2c3dec99ebd4fa83c99c470b0f048e5b93cfb19e0730b1b67d' 
  AND token = 'PMbxXKVunI0wl1x2JDYtakuNDu1jAz3f64q6aV6IBow=' 
  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"
    }
  }
}