Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb23ead0def293bc80f506323e079158f1e1bae3e41d970df3f6f4628089139' 
  AND token = 'KrsGAZaj1ZyFMsKWlPhd5YDIbW/fWCVVlDyoOQ/KKiM=' 
  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"
    }
  }
}