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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b579050d24b82b49912f4edc3f4584df1b8fe20bce5211523dbe86a12f6745f5' 
  AND token = '2jLxYb7O6u4N2gAEbUHgghk9H0ROg73TeVPQZgrUx6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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