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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c8b36872092663f19a75b79910a59123f0e1d1b260c2b5421d9f5111ba4b57' 
  AND token = 'VA2yo1aTk884nw6Vk+LIj/GCck3L2Gjt6kNux0qTkZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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