Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade081311e1d3651fbc4a59d82113a5edf793bbef32881f20da3ab0fca06b55f' 
  AND token = 'U7xnz/kCqY2Wd2/jTIypfnnIJwAv8yORtO/c/lWWeDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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