Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db42cf48c2f8c5ad4ac62a1a369f0834cf3f1b6902851ace7b20bd6ae2844e87' 
  AND token = 'xNwDTzGwQC+EQYxmcR5kprt96swDhQa6NrpMlEN1d00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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