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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ebde101f951ddffb49084c2b2da0c4b0554c08de9eef819c4ede8073abfe5e' 
  AND token = 'hknQ3qiq6Ns7bHGqfh//UPIOTTKTViCcK6Xwq7NgdIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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