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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014bdabe1490d4120d6e7bb4cfbbd797d69dcfdd53a559dd068ddb83f8166fc6' 
  AND token = 'DcE4uWy5YBc4mWd6e+NRZDuBbXyzt7eIlsy0xo4DINk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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