Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8cca55715390e6705354be23f65f710b4b27acbb73fb13dbd36eee23eae0d5' 
  AND token = 'Yx/m8NOX7/LTPZAbmq8eo4mOWjqRnusQjz/l2Ilg66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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