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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40c2c666d458a6b0447c572c394b43bb1c5b07e26075dd40b013468001e9820' 
  AND token = 'xuqpiaxCHM+kV1JPBEg6AutpkGko3lkXA0bKlWVfHqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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