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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af32a2e725c7df6d314d70e9fad087418ebfef5999d9b8c03521fd7efcad383' 
  AND token = '1qBAhU6o5uuad952IfdxSg5d3EqgYy7ml/elktgyBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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