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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbccb9263bb1f61ad18827bba1ab851f5a9b156c945e4c903594c77c80199d0' 
  AND token = '/CUPFLW91AxFHuIjmDgbrpi7vNP2C8zoIxp0obcB2Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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