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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61de44da7642ff1626da9a04ecd572a5ead018229314fbfe3c41e0ab43f7859' 
  AND token = 'IGunjnS8Wb8Ah7KllyJDuNd4HsaGGZ6pxV4bhUed9kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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