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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08514d27aa9a0adb78ee7a0985253f57b27d6e92b300aa08df92b322a5bd661d' 
  AND token = 'M+pKu/Box+faq8p8P05kfxRM6Q72QbOH6TVKpY1vPRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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