SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7386b06b413a1afeeec3ba584f4ace15ce35902973f3ccf242c79466b745d9' 
  AND token = 's1VQjzlCYvhKNXxoGQ1zR5iMXPiWj6BaMkz9hZqWju4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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