Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a67c4356094995edbe2fe8a0cf3cfb3ccd6c3f7d98fbe683ef13e818c0deac' 
  AND token = 'jvu6SKepRJD7aPO+SvtZZ4Bt6bwIW6Ly+wDLawp9f5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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