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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1723878911b7d4e6bb4591b4b8f6a8e9edc479ad5986f209f3b0f91828165d7' 
  AND token = '0XXhfHQDRyfIrIO/t64o7LjcY2/Wym46A2qnluKaERE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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