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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ddf9e71ed0260d57bce4318f6e0fc9c8925480a7882f162ed2d88756341660' 
  AND token = 'x+df2I+TOcewj5TR1Vl8/5lgbtzNBn7f2L3xBJTfWwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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