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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbb56e86cc34cdc9c34029b52fc34f8c6259169f19b8b1f333c70d658df5cda' 
  AND token = '50hx5pijgnuVOOtg9Fx8ocRA+xgFsUe2CHuI//mVoz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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