SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0da61e55b2a784ad4f55126ebc308750144d2483e7576cb17fd5904838b0ac' 
  AND token = 'mr9tcsKFjhPKboCrz/Wlt9JE/YOGYGTi6qRAV1xLBfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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