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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1624f1dc614b6e4de0d86c45b6e8fbc6ee220d6671e50367a46d726ce8f4f08f' 
  AND token = 'zcLCWf/7QPUtTx+m5osZ8O56loJnFIRdtVD78IWQ7t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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