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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82ebca1c9405c9f099e747c2f97391da8b03ee90e28480775fc77504100bbd0' 
  AND token = 'dIS/4l04VfwOavA6CrdBTZJBWZ582FLznLijPqTMvY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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