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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74c21e40936951d1d535ccba372d96afd3707f452525eeadeaa7598d14ed8c5' 
  AND token = 'qv0zuSByAC53hoJhCfSrOoMWjZ7oN8EbbcAvhJlX1Xs=' 
  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"
    }
  }
}