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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dab8740dbb85060e889148ff6293309de6fdcc4dbd8ffee4c2f7692765689e' 
  AND token = 'D72G0pHb8p8TRJQHu6ZuPtlO+Ys+PZrKmlg2tSC3cfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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