SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d6bdd1381268d8ff488f09b784309b69831c4cad0805f35e85d4badfeedaff' 
  AND token = 'AYXi+9m/2BZrfH0uZdRaLKM5WaLiIz2i7vBVG/0ZgbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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