Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e25b26d21b2040e9d1b96079d2204b90d3a8b4eb30d567c362aa7a0bec25c8c' 
  AND token = 'm7e+MPypKY8NRt8em2ryzTKs8QwHHToCWM89+qs+ftQ=' 
  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"
    }
  }
}