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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a7f626d4fd87cddb5a59fd94627f256b89a067806c628f7477569105aaeea3' 
  AND token = 'YN8wAQClABdA43QG+nbdok5KmYGry6wkYSFNAZagNwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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