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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1391057a647b495249db7a9b3dcf08a4d02ffc05191805475cfa0f5a7a02f012' 
  AND token = 'atZg9az/G177FGtEyB4277mBdzWnLg02cxfB1fqoB78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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