Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab1086c793af934171018edb42d35d9ac87d8fd2a28e344746c3045b8e8d4c9' 
  AND token = '4M8nvFKqcL8T7gQSTyy3OSSfJ4GozbQCvJErvTxD3iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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