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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f670edb167505a4b9b90e7cdfbbd00e2a2fc166ede61601f29370a8e77a7d61f' 
  AND token = 'zKztBCp/+OMLVUTr51w/yNXx7J0CUcRc9jy/4JHYD7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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