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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941db9ae362a8b9e4b53fff76750e4c7ef1ca7127a6a67fcca264a687afef3d4' 
  AND token = 'KrRJ6wHHfczTKVtugdo7c38+7TJjm6MSIVdgGkKwXbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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