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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca590d79577db8b5040ee2b37e58f2b38caf8dfc822dd13660d387a9ccce4aa' 
  AND token = 'QVv6UVo1IBy82McdJ186XqMNHgpupPDq091OXck/eGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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