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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00048c83ebe8f331603d0b515c55fa895da184d230089d453589c9d80d7be83e' 
  AND token = 'ARuDQKInSgEJsx4Zzmq2S6fHGwzsk3sYMT6huw8kQ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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