Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fa1e9405dc51ec142cb9d808eabbf52020f5452effb3561bbc0872e480523a' 
  AND token = 'UlZ+apTI3fFnqdCiomRVaByOhudoCRJXmR+H9vgWu3c=' 
  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"
    }
  }
}