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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74a7ab08f29e256a56875a95df08e86bd6f6111413a919f337ded8f84cd4a59' 
  AND token = 'yxsBw7j0ozN+mt1LVoUigNejAFw59lSFI33XDDxzdBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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