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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6646e4898727b432db8bc86b02286ab107e7b798c372ae96d35667c4a70877' 
  AND token = 'Wq6cm8/ipE3xZVn0GvMExTcrcHi3xaNQTtL2wTGbYqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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