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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d97557b5d7126845c78abc86e64cd1c316cd2409d85ee8c41e4c96540237f9' 
  AND token = 'V3duwElzYl9kJP/EijxxX8f4p2KzAD7oiCXCxHqHNeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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