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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b6d3d6caffeccd18d48e7ec472ae53b648ab26fad2c4f7603c61942b1f4702' 
  AND token = 'Rn8UtbSPFzCoepdFz4YK2okzD+bWDzIwoh7PFIAJVbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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