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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a523cf329578e75292c075ed6e3eb3f49445b951da99e9ef4c4d9f31f001bdb' 
  AND token = 'E9NJ463JXvBTQya3lLUdPJwnyj60mDW44Jsq1SsxDsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00410

JSON explain

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