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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a9423f2737301672cf043575ea653eb4cb0abffc8533192b73a813dae13ca3' 
  AND token = 'VBm3u9b49IuEPwyOcP9PZPNVKfLW4a/AaBKDYSiIvUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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