Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0049919b5612d304c06ffeac92e7d1a7bbeb7e70c4a66853dd1810e386ba2392' 
  AND token = 'HfyM2s6RgNrHm0QJu2wM5PSjwqYXkf7BquDh9EC3TjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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