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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7c240f96e348f7685bb18262c05019d09d0e80bb311cd8e647756d5b3894c5' 
  AND token = 'leq7Yat+uG8WCbNLiS0PuzC8d3EN8NSZgEUAU/c7yVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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