SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b41145a7b359873ae6be5093faf546884d821df2e74348170d29c23757c788e' 
  AND token = '7GxLVA/S7KZJaSTP5j+FwU9ArDe50MPxFq9YzpU/a0c=' 
  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"
    }
  }
}