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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3947593af493a6ce022526fafe8e1a5469cb5694394a9bdd915be5091141d295' 
  AND token = '2FD1Z8QS/qBT4OquvsLKeHTyBcc/6Sn8jUGfWpXBedw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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