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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6864095b7f5c487b6c50ae479bae30355c35149e35bb74a324dbe0db68e4ad' 
  AND token = 'cOsuU22RWGSAaQvH+SnjgftUiCFsclgUy2ty2gzK+jE=' 
  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"
    }
  }
}