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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcddb2cb9d3178ebb05f4ff152863049e528186e3178192c99f282559d69f12' 
  AND token = 'mm08Bjb2rVwV5udn/C7PMLbfIOG2qOT6mzd8FxvMUs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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