Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c843ff88df098860d08d7e72f330b49c1965a6c49d0e2b6ca26cef36334b480' 
  AND token = '6mWmeKNRe29blncWirsZ2rmqlqgCujZzImWYhwKmYDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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