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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae60d1695cfb86a82e8ce1ca33c47ca42aa84b1cffbf5a60b3b088a3d3b61de' 
  AND token = '6V0hK7D618wvwuq98xUQcXHgjUy+69/NjC867Y7QYzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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