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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb16565e6fb1881e94dad40842bfa5bb5094f736b13af363a4887923ee0cf585' 
  AND token = 'PBRut7IPZoLFFkg9YoK678AHMwg9Hp8xyzMB2ZPuP2w=' 
  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"
    }
  }
}