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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67369268c7e9f53b34a0930f4739110daccbad9a3c1e9f5d65b4f24c2bbac21' 
  AND token = 'lgbfCeA8BW5vGGUGybuATAdzqi/AWbnbujBct4eaxiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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