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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2abba0f963d7505ea9063aaae86d55c456ebe9e72754dab460df562b623c8aa' 
  AND token = 'B1Bc5V9BH8XYAG/M1Nonx7t14TyQWKnmK8U0haiPwLU=' 
  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"
    }
  }
}