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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658f2db152485b2d9936c2ef1b6f7d6d4915aad490f63ce86cc95100aa4b9f51' 
  AND token = 'qQNvlooNfc3ytNcDx5hgu5FBrgPXPO/E6jg+f+cp6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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