Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb4c8a0b9e656910a17a8547d2ab33044d602b666abf6449f95469fe28012ee' 
  AND token = '1rPMqCUwI8G5ie92tmO4XLV5CJ0sig2+fbMXGTFOBSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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