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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55cbfc8d30b802258462ccd262f58948297f1774aff4654c6b9750e00b825e7' 
  AND token = 'K0pKHQ/pgDMFHdCJsnq2OHqszypUOt+pzAAOdGQ1Txs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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