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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111d9f84f0a0a9e4eff336be77113613956a3db56958d7ecad5d109ebddac262' 
  AND token = 'DQFmQ76dg01ihIfS9iPS9kdYNEIsf8sffG1Znr6Oq8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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