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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538bb36c3ccb7199de75da19e4ee493a843613594c922ced6d0e878e93399061' 
  AND token = 'iO/5jGNYZBrURQfATxDfN84Dor2a6hvRyEI+DA6iFgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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