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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86c9ba21b1e7b4007a745a005c26a86a028b5650fdd04e1e7ed0d3312c6b13d' 
  AND token = 'xYgJ4cuvO/cgyk43rhmM4Wiysg1eXll8jVL49B59C+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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